A differentiated path availability protection approach in WDM rings

A differentiated path availability (DPA) protection approach in WDM ring networks was introduced. This approach can minimize the total wavelength mileage of ring, while guaranteeing the required path availability degree of each connection. The simulation result shows that in the uniform traffic study the used wavelength mileage decreases and the reused wavelength mileage increases, as the required availability degree of connection becomes lower. This rule fits in different traffic proportion scenarios.